<article id="wikiArticle">
<p></p><p></p>
<h2 id="Summary" name="Summary">概述</h2>
<p><strong>normalize()</strong> 方法会按照指定的一种 Unicode 正规形式将当前字符串正规化.</p>
<h2 id="Syntax" name="Syntax">语法</h2>
<pre><code class="language-javascript"><code class="brush:js;"><em>str</em>.normalize([form])</code>;</code></pre>
<h3 id="参数">参数</h3>
<dl>
<dt><code>form</code></dt>
<dd>四种 Unicode 正规形式 "NFC", "NFD", "NFKC", 以及 "NFKD" 其中的一个, 默认值为 "NFC".
 <ul>
<li>NFC - Normalization Form Canonical Composition.</li>
<li>NFD - Normalization Form Canonical Decomposition.</li>
<li>NFKC - Normalization Form Compatibility Composition.</li>
<li>NFKD - Normalization Form Compatibility Decomposition.</li>
</ul>
</dd>
</dl>
<h3 id="可能出现的异常">可能出现的异常</h3>
<dl>
<dt><code><a href="Reference/Global_Objects/RangeError" title="RangeError对象标明一个错误，当一个值不在其所允许的范围或者集合中。"><code>RangeError</code></a></code></dt>
<dd>如果给 <code>form</code> 传入了非法的参数值, 则会抛出 <span><code>RangeError</code> 异常.</span></dd>
</dl>
<h2 id="示例">示例</h2>
<pre><code class="language-js;">// Initial string

// U+1E9B: LATIN SMALL LETTER LONG S WITH DOT ABOVE
// U+0323: COMBINING DOT BELOW
var str = "\u1E9B\u0323";


// Canonically-composed form (NFC)

// U+1E9B: LATIN SMALL LETTER LONG S WITH DOT ABOVE
// U+0323: COMBINING DOT BELOW
str.normalize("NFC"); // "\u1E9B\u0323"
str.normalize(); // same as above


// Canonically-decomposed form (NFD)

// U+017F: LATIN SMALL LETTER LONG S
// U+0323: COMBINING DOT BELOW
// U+0307: COMBINING DOT ABOVE
str.normalize("NFD"); // "\u017F\u0323\u0307"


// Compatibly-composed (NFKC)

// U+1E69: LATIN SMALL LETTER S WITH DOT BELOW AND DOT ABOVE
str.normalize("NFKC"); // "\u1E69"


// Compatibly-decomposed (NFKD)

// U+0073: LATIN SMALL LETTER S
// U+0323: COMBINING DOT BELOW
// U+0307: COMBINING DOT ABOVE
str.normalize("NFKD"); // "\u0073\u0323\u0307"
</code></pre>
<h2 id="规范">规范</h2>
<table class="standard-table">
<tbody>
<tr>
<th scope="col">Specification</th>
<th scope="col">Status</th>
<th scope="col">Comment</th>
</tr>
<tr>
<td><a class="external" href="https://www.ecma-international.org/ecma-262/6.0/#sec-string.prototype.normalize" hreflang="en" lang="en" rel="noopener">ECMAScript 2015 (6th Edition, ECMA-262)<br/><small lang="zh-CN">String.prototype.normalize</small></a></td>
<td><span class="spec-Standard">Standard</span></td>
<td>Initial definition.</td>
</tr>
</tbody>
</table>
<h2 id="浏览器兼容性">浏览器兼容性</h2>
<p></p><div class="blockIndicator warning"><strong><a class="external" href="https://github.com/mdn/browser-compat-data" rel="noopener">We're converting our compatibility data into a machine-readable JSON format</a></strong>.
            This compatibility table still uses the old format,
            because we haven't yet converted the data it contains.
            <strong><a class="new" href="/zh-CN/docs/MDN/Contribute/Structures/Compatibility_tables" rel="nofollow">Find out how you can help!</a></strong></div>
<div class="htab">
<a id="AutoCompatibilityTable" name="AutoCompatibilityTable"></a>
<ul>
<li class="selected"><a>Desktop</a></li>
<li><a>Mobile</a></li>
</ul>
</div><p></p>
<div id="compat-desktop">
<table class="compat-table">
<tbody>
<tr>
<th>Feature</th>
<th>Chrome</th>
<th>Firefox (Gecko)</th>
<th>Internet Explorer</th>
<th>Opera</th>
<th>Safari</th>
</tr>
<tr>
<td>Basic support</td>
<td>34</td>
<td><a href="/en-US/Firefox/Releases/31" title="Released on 2014-07-22.">31</a> (31)</td>
<td><span style="color: #f00;">未实现</span></td>
<td><span style="color: #f00;">未实现</span></td>
<td><span style="color: #f00;">未实现</span></td>
</tr>
</tbody>
</table>
</div>
<div id="compat-mobile">
<table class="compat-table">
<tbody>
<tr>
<th>Feature</th>
<th>Android</th>
<th>Chrome for Android</th>
<th>Firefox Mobile (Gecko)</th>
<th>IE Mobile</th>
<th>Opera Mobile</th>
<th>Safari Mobile</th>
</tr>
<tr>
<td>Basic support</td>
<td><span style="color: #f00;">未实现</span></td>
<td>34</td>
<td><span style="color: #f00;">未实现</span><br/>
<a class="external" href="https://bugzilla.mozilla.org/show_bug.cgi?id=864843" rel="noopener" title="FIXED: Enable ECMAScript Internationalization API for b2gdroid">bug 864843</a></td>
<td><span style="color: #f00;">未实现</span></td>
<td><span style="color: #f00;">未实现</span></td>
<td><span style="color: #f00;">未实现</span></td>
</tr>
</tbody>
</table>
</div>
<h2 id="See_also" name="See_also">相关链接</h2>
<ul>
<li><a class="external" href="http://www.unicode.org/reports/tr15/" rel="noopener">Unicode Standard Annex #15, Unicode Normalizatoin Forms</a></li>
<li><a class="external" href="http://zh.wikipedia.org/zh-cn/Unicode%E7%AD%89%E5%83%B9%E6%80%A7" rel="noopener">Unicode 等价性</a></li>
</ul>
</article>